#OpenCL device fission / device partition works fine on #CPU with #PoCL (I can get it to use only 15 of my 16 cores/threads if I like) but on #AMD #GPU the call to clCreateSubDevices just returns "invalid value", which I guess means "not supported". I was hoping to leave 1 compute unit free in the hope that it wouldn't make my desktop environment completely unusable for the duration of the computations.